(19)

(11)

EP 2 769 048 A1

(12)

(43) Date of publication: 27.08.2014 Bulletin 2014/35 (21) Application number: 12769018.8 (22) Date of filing: 04.10.2012

(51) International Patent Classification (IPC):  E21B 17/00(2006.01) E21B 17/02(2006.01) (86) International application number: PCT/EP2012/004151 (87) International publication number: WO 2013/056790 (25.04.2013 Gazette 2013/17)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 17.10.2011 FR 1103168 23.11.2011 US 201161563056 P (71) Applicant: Vallourec Drilling Products France FR-58200 Cosne Cours sur Loire (FR)	(72) Inventor: ROUSSIE, Gabriel 59300 Valenciannes (FR) (74) Representative: de Kernier, Gabriel  Cabinet Netter Conseils en Propriété Industrielle 36, avenue Hoche 75008 Paris 75008 Paris (FR)